I have a 93 Commander 21' Berkley jet w/A impeller. 468ci stock guessing 275-300hp. 750CFM carb.  It turns 4400 rpms and goes 55mph with 2 people and ice chest.  Im going to rebuild the engine.  I want more speed.  I have a merlin head  ready to go and i'm planning on going full roller.  The cam i want is a Comp Cam, Extreme Marine # XM284HR: Cam & Kit.  I'm hoping for 500HP and 5500rpm.    Will this cam work?    Any thoughts anyone.  I dont know much about engine building and any comment is appreciated.
Happy Boating...     John

This is the link for the cam kit.
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=K11-451-8&Category_Code=MARKIVCAMHRXM